I do always seem to somehow spend all of my money but I get it back quite easily by defeating the White Treehollow over and over and that boosts my money right back up there. I think they should keep it the same, although my opinion could change depending what is in the new game etc ... because if player customization is available I wouldn't want to have to defeat 1000 Pokemon trainers just to be able to afford a pair of socks for my character xD